Pump



L. H. JENSEN.

PUMP.

APPLICATION FILED FEB.14, 1920.

1,362,004, Patented Dec. 14, 1920.

UNITED STATES LAWRENCE I'I. JENSEN, OF ST. CHARLES, ILLINOIS.

PUMP.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application led February 14, 1920. Serial No. 358,656.

To all whom t may concern.'

Be it known that I, LAWRENCE H. JENSEN, a citizen of the United States, residing at St. Charles, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Pumps, of which theV following is a specification.

rThe invention relates to pumps of the type particularly adapted for use in inflating pneumatic tires, air storage tanks, and the like; and the general object thereof is to provide a high-power pump which may be constructed at a minimum cost.

A more specific aim of the invention is to provide y an operating mechanism for a pump, which is of an advantageous character in that the power applied to the oper ating handle is transmitted to the piston rod with a maximum degree of efliciency; in that the movement of the piston 'is accelerated when the state of compression within the pump cylinder is the lowest, while the effective force exerted upon the piston gradually increases as the pressure builds up in the cylinder; andfinally in that in the operation of the parts,friction is reduced to a minimum.

In the accompanying drawings, I have illustrated a preferred embodiment of my invention, but it is to be understood that in th'e interpretation ofthe appended claims they are not to be limited to the precise construction or arrangement set forth, except as may be necessitated by the state of the priorart.

In the drawings, Figure 1 is a side. elevation of my improved pump with a portion of the operating handle broken away, the position of the parts when the piston has reached the end of its stroke being shown in broken lines. Fig. 2 is an edge elevation of the pump with the operating handle broken away and shown in Fig. 2a.

The device comprises essentially afoot or base plate 1, a pump cylinder 2, pivotally mounted upon the base plate and having a piston 3 therein with a rod 3a. 4 designates a support also pivotally mounted upon the base plate 1 and providing a fulcrum for an operating arm 5 and a lever 6, the latter b eing connected at its opposite end to the. plston rod 3a. The operating arm 5 has'a movable connection with the lever 6 which herein consists of a link 7.

The base 1, and pump cylinder 2, with the piston 3 and rod 3a may be of any usual or preferred construct-ion, forming per se no part of the present invention, the cylinder 2 being provided with the usual outlet 8. The base plate has an upstanding portion 9 upon the upper end of which, on a pivot 11, is mounted a bracket 10 carrying the pump cylinder 2.

l The support 4 is pivotally mounted relative to the base 1 and preferably co-aXially with the pump cylinder 2 upon the pivot pin 11. Preferably it comprises a pair of bars 4a and 4b formed of a length substantially greater than the pump cylinder. The bars are spaced apart as shown in Fig. 2 so as to form a rigid swinging bracket or arm, being connected near their free ends by pivot pins 12 and 13 and mounted at their lower ends at opposite sides of the bracket 10 upon the pivot pin 11.

The pivot pin 12 also serves asa pivotal support for the operating arm 5, being for this purpose positioned a short distance from the free end of the support 4. Similarly, the pivot pin 13 provides a pivotal support or fulcrum for the lever 6 at the free end of the support et. The arm 5 may be bifurcated in form as shown in Fig. 2, and comprises a pair of arms 5a and 5b spaced apart suiciently to lit neatly between the bars 4a and 4b at their pivotal connection therewith, and connected at their opposite ends by means of a pair of pins 15 and 16 with sufficient space therebetween to receive the lower end of an operating` handle 17. The pin 1 5 may be -made rigid with the handle so as to engage in notches 15a and 15b in the upper ends of the arms 5a and 5b, and the lower end of the handle is preferably curved so as to clear the pin 16, being notched at its free end to receive a pin 18 carried by the arms 5n and 5b. The pin 18 may be in the form of a screw having awing nut adapted to lock the handle in position with reference to the arm 5. To avoid an eXtreme curvature of the lower end of the handle it may be notched as at 16a to receive the pin 16.

The lever 6 is in the form of a single bar, being spaced midway between the upper ends of the bars 4a and 4b upon the pivot pin 13 and suitably connected with the upper end of the piston rod 3 by means o' a member 19 and a pivot 2O. l

The link 7 is connected near one end of the arm 5, being pivotally mounted on the pin 16, and at its other end is pivotally connected by means of a pivot 21 with the lever 6. Preferably the link is made of two arms 7? and 7b arranged one on each side of the lever 6 and entered at the opposite ends between the arms 5a and 5b of the operating arm 5. The parts are so proportioned and arranged that as the arm 5 is swung downwardly by means of the handle 17, the pivot 16 moves with relation to the pins 21 and 2O so as to increase the effective length of the powerarm of the operating arm 5 and hence act with increasing force upon the lever 6 as the piston approaches the end of' its stroke. It will be observed that the lever 6 Vand piston rod 3a form in effect a toggle, the parts of which are moved substantially into alinement as shown in dotted lines in Fig. 1 at the end of the piston stroke.

It will be seen by reference to Fig. l that the link 7 is adapted to transmit to the lever 6, the force applied to the operating handle with a maximum degree of efficiency. By eliminating all relatively sliding connections sometimes employed, not only is triction reduced to a minimum so that the durability of the operating mechanism is ma.-

terially increased, but the cost of construction is also substantially reduced.

I claim as my invention:

1. In a pump having a cylinder with a piston and a piston rod operatively associated therewith, the combination oia pivotally mounted support, an arm pivotally connected with said support at a point spaced from its free end, a lever pivotally connecting the free endof said support with the free end of said rod, and a link connecting said arm with said lever and adapted to transmit force applied to the arm to the piston rod through the medium of the lever, to a gradually increasing degree as the piston approaches the end of its stroke.

2. In a pump having a cylinder and a piston rod, the combination of a support, a.

base upon which said support and said cylinder are mounted for relative swinging movement, means connecting said support with said rod including a lever, an arm pivotally mounted on the support at a point spaced from its free end, a link connecting said arm to said lever, and means for swingy ing said arm, said lever and the piston constituting a toggle the parts of which are adapted to be moved into substantial alinement by the operation of said arm.

.3. In a pump having a cylinder and a piston rod, the combination of a base support being of a length substantially greater than the pump cylinder, a lever connecting the free end of said support with said rod, an operating arm fulcrumed on Said support, and means pivotally but non-slidably connecting said lever and said arm and operable in the movement of the arm to move said lever and the piston rod substantially into alinement.

et. In a pump having a piston rod, the combination of a support, a lever pivotally connected directly to the support and to the piston rod, and means including a second lever pivotally connected with the first lever so as to move relative thereto toward and from the upper end of the piston rod whereby to exert a gradually increasing leverage upon the piston rod as the latter approaches the end of its stroke.

5. In a pump having a cylinder and a piston rod, the combination of a pivotal Vsupport or fulcrum, a pivotal connection between the support and the rod consisting solely of a lever, and an operating arm pivoted to said support and having -a movable connection with said lever permitting movement of the operating arm toward and away from the upper end of the piston rod whereby the effectiveleverage exerted by the arm upon the piston rod increases as the compression in the cylinder rises.

6. In a pump having a cylinder and a piston rod, the combination of a support upon which the cylinder is pivotally mounted, a second support pivotally mounted upon the first support and of a length substantially greater than the length of the c vlinder, a lever connecting the free end of the second support with the free end or" the `piston rod, an arm pivotally connected with the second supportV at a point removed from the connection of the lever therewith, means for swinging the arm, and meansV operatively connecting said arm with said lever whereby the eiective force transmitted by the lever from the arm to the piston rod increases gradually as the rod approaches the end of its stroke.

7. In a pump having a cylinderA with a piston and a piston rod, the combination of a member of a length substantially equal to the combinedV length of the cylinder and piston rod, means for supporting the cylinder and member for relative swinging movement, a member pivotally connecting the free end of the first mentioned member with said rod and forming with said rod in effect a toggle, and means pivotally connected to the first mentioned member and operatively connected with the second member for movement relative to the latter toward andrfrom the tothe support and operatively connected upper end of the piston rod whereby to move with the first lever so as to be movable bod- 1o the parts constituting the toggle substanily toward and from the point of connec tially into alinement. tion of the first lever with the rod in the 5 8. In a pump having a rod to be recipoperation of the pump.

rocated the combination of a support, a le- In testimony whereof I have hereunto set ver pivoted directly to said support and also my hand. to the rod, and a second lever` also pivoted LAWRENCE H. JENSEN. 

